SO my 01 xterra has not given me any signs of pending trouble, other than a knock sensor code and an evap code. I left one night to go to work, drove the truck there and then to the local Waffle House first thing in the morning. No problems. Shortly after leaving Waffle House, it starts jerking and sounding like it's going to stall while driving 65+ down the interstate. The only new code is a catalyst system code, but Ive had that code drop for so many things its crazy. The truck will start and then have a rough idle, to where it will stall itself out. The time it takes to stall is not consistent, sometimes within 10 seconds sometimes within minutes. I can get it into gear and it will not stall out after moving, as long as I am above 10 mph. If I hit the brakes and get down to about 10 it will die on me. It doesn't matter how fast I get to, the constant stutter is there, at 45 at 50 at 70 the car jerks and stutters. This morning I noticed that it constantly sounds like it is trying to backfire as well. Anyone have any ideas or suggestions?